CIS - Certified Instrument Specialist Instrument Inspection and Testing 1 — Questions and Answers
Question 1: Which method is used to verify that the tips of tissue forceps are properly aligned?
- Holding the forceps up to a light source and checking for any gap between the tips when closed (Correct answer)
- Submerging the forceps in saline solution and checking for bubbles
- Applying pressure to the handles and measuring deflection with a gauge
- Checking the manufacturer's color code on the handle
Correct answer: Holding the forceps up to a light source and checking for any gap between the tips when closed
When tissue forceps tips are properly aligned, closing them against a light source will reveal no light gap between the tip surfaces. Any visible gap indicates misalignment that could compromise tissue grasping and patient safety.
Question 2: What is the correct way to inspect the tungsten carbide inserts on needle holders?
- Visually examine the jaws for pitting, cracks, or missing carbide particles (Correct answer)
- Test the insert hardness with a file
- Measure the insert thickness with a micrometer
- Soak the jaws in acid solution and look for discoloration
Correct answer: Visually examine the jaws for pitting, cracks, or missing carbide particles
Tungsten carbide inserts should be visually inspected for pitting, cracking, or missing carbide fragments. Damaged inserts can fail to grip needles securely, creating a suturing hazard during surgery.
Question 3: A surgical instrument that produces a high-pitched squeak when operated most likely indicates:
- Proper function with adequate lubrication
- Metal-on-metal friction due to insufficient lubrication (Correct answer)
- Ultrasonic cleaning residue trapped in the joint
- A non-functional ratchet mechanism
Correct answer: Metal-on-metal friction due to insufficient lubrication
A squeaking sound during instrument operation is a classic sign of metal-on-metal friction, meaning the instrument is inadequately lubricated. Instruments should operate smoothly and silently after proper lubrication.
Question 4: When inspecting serrations on a surgical instrument, the technician should look for:
- Uniform depth and pattern without bent, broken, or missing teeth (Correct answer)
- A shiny, polished appearance indicating wear
- Serrations that are wider at the tip than at the base
- A brown oxide coating that protects the serration edges
Correct answer: Uniform depth and pattern without bent, broken, or missing teeth
Serrations must be uniform, intact, and undamaged to grip tissue or materials properly. Bent, broken, or missing serration teeth reduce the instrument's holding ability and may indicate the instrument needs repair or replacement.
Question 5: What does a white or chalky residue found on instruments after sterilization most commonly indicate?
- Protein deposits from inadequate decontamination
- Mineral deposits from hard water used during processing (Correct answer)
- Residue from enzymatic detergent not fully rinsed
- Normal oxidation from steam sterilization
Correct answer: Mineral deposits from hard water used during processing
White or chalky deposits on instruments are typically mineral scale (calcium and magnesium) left behind by hard water during washing or rinsing. This indicates a need for water quality improvement, use of deionized water, or instrument descaling.
Question 6: Which test is used to evaluate the integrity of the surface finish on stainless steel surgical instruments?
- Dip the instrument in a copper sulfate solution for 6 minutes and inspect for copper deposits (Correct answer)
- Expose the instrument to UV light and look for fluorescence
- Submerge the instrument in distilled water and check for rust within 24 hours
- Apply a magnetic strip to the instrument surface and measure adhesion force
Correct answer: Dip the instrument in a copper sulfate solution for 6 minutes and inspect for copper deposits
The copper sulfate test (per AAMI standards) detects compromised passive oxide layers on stainless steel. If copper deposits adhere after a 6-minute soak, the instrument's corrosion-resistant surface has been breached, making it prone to pitting and rust.
CIS - Certified Instrument Specialist Instrument Inspection and Testing 1
Which method is used to verify that the tips of tissue forceps are properly aligned?